Blaydon-on-Tyne Water Hardness & Quality Report (2026)

Northumbrian Water supplies Blaydon-on-Tyne, an industrial town on the south bank of the River Tyne in Gateshead made famous by its racing song, from the Kielder Reservoir via the north-east aqueduct system blended with treated River Tyne sources, treated at Horsley Water Treatment Works near Ovingham in the Tyne Valley before distribution across Gateshead and the Tyne corridor. At 112 mg/L (7.9°Clark), Blaydon's water is moderately soft, reflecting the dominance of the Kielder supply — the largest man-made reservoir in England — which drains the North Tyne headwaters in the Border Moors.

Kielder Reservoir is fed by the North Tyne and its tributaries draining the Kielder Forest and Cheviot Hills — a landscape of Devonian and Carboniferous sedimentary rocks, thin peaty soils, and conifer plantation. This geology yields soft, calcium-poor moorland water. Blended with treated River Tyne water (which carries modest mineralisation from the Carboniferous Coal Measures and Millstone Grit of the Tyne Valley catchment), the resulting TDS of 276.2 mg/L and hardness of 112 mg/L is the characteristic moderately soft supply of the lower Tyne Valley industrial communities.

At 112 mg/L, Blaydon's water is moderately soft with manageable limescale demands. Descaling the kettle every six to eight weeks is typically adequate. The combi-boiler benefits from a fitted scale inhibitor as a standard precaution. Washing-up liquid lathers well at everyday quantities. Taps and shower heads develop only light limescale deposits over several weeks; a monthly wipe with white vinegar keeps fixtures in good condition. The moderately soft Kielder-Tyne supply has been a consistent feature of Tyneside water quality since the Kielder scheme opened in 1982, benefiting communities across the Gateshead riverfront.